Face-plate for grinding-mills.



. PATENTED OCT. 1 8, 1904. 0. CARB..v

PACE PLATE FOR. GRINDING MILLS.

APPLICATION FILED DBOJ?. 1903.

N0 MODEL.

. UNITED STATES Patented October 18, 1904.

PATENT OFFICE.

' FACE-PLATE- FOR GRlNDlNG-NIILLS.

SPECIFICATION forming part-of Letter: Patent No. 772,642, datedOctober18, 1904.

i vApplication filed December 1'7, 1903. Serial No. 185,531.. v(Nomodel.) i

To all whom, t may con/cern.:

Be it known that I, OuA CARR. a citizen of the United States, residingat Buenavista,

' county of Rockbridge, State of Virginia, have Vof the assembledmachine; Fig. 2, a vertical sectional view of a portion of thegrindingdisks;A Fig. 3, a face view of vone grindingdisk; Fig. 4, asimilar view of the other grinding-disk; Fig. 5,y a detail verticalsectional view ofa portion 0f one of the grinding-disks, showing aslightly-different form of faceplate.

The ordinary attrition or face-plate grinding-mills of both horizontaland vertical types employ plates or disks upon which are cast variousforms of breakers or nubs, the breakers on one disk being so arrangedwith respect to those on the other that the material placed between thedisks is ground and broken up, the extent of grinding being dependentupon the clearance space between the grindingbreakers. `The breakersv ornubs are formed integral with the face-plates, such plates beingremovable in order that new plates may be inserted when the breakershave become worn to suchan extent as to impair the efficiency of themill. The speed of these grinding-disks is very high and the wear uponthe surfaces is rapid, so that to maintain the eiiiciency of theapparatus frequent renewals of the face-plates are necessary.

It is one of the objects of this invention to `provide a face-plate madeup in segments, each segment being independently removable,

and toprovide each of these segmentswith independent removable breakersor grinding devices which are so mounted as to present numerouscutting-surfaces to the material worked upon, said surfaces orcutting-points changing their position during the rotation of thegrinding-disks.

A further object of the invention is to provide the face-plates withremovable breakers disk travel.

Vingvtlie operation of the apparatus.

Referring to the various parts by numerals, l designates a pair ofgrinding-disks, each of which is rigidly mounted upon the inner end of ashaft 2. The material to be worked upon is fed through the center of oneof these disks by means of a hopper or chute 3. Each disk is providedwith a series of segmental faceplates 4, which t closely within theannular outward-extending marginal iange 5 of the disk. Eachface-plateis provided with a plurality of annular series or rows ofapertures 6, in which snugly t horizontal outward-eX- tending screws 7.-These screwsdare provided at their inner ends with enlarged heads 8,which bear against the inner face of the'disk and lie between the sameand the face-plate. These face-plates are secured rigidly to the disksby means-of bolts 9, .whose heads are counter sunk in the face-plate. Bythis means the bolts 9 serve to not only hold the face-platesin positionon the disk, but also to maintain .the breakers 7 in position in theface-plates.

The breakers or grindingvdevices 7 of one disk are complementary to thegrinding devices in the opposite disk, the breakers kof one disk formingraces or ways in which the breakers or grinding devices of the oppositeThe projecting part of each breaker or grinding device is Yformed with ascrew-thread or a similar annular or spiral groove in order that it'willpresent numerous sharp cutting edges to the material. While the bolts 9will secure the segments of the face-plates to the disks, the cutting.devices or breakers 7 will be free to rotate independently intheface-plates, so that fresh cuttingpoints will be presented to thematerial dur- In order to secure this freev rotation of the cuttingdevices, the face-plate segments are provided with lugs 4 to bearagainst the disk, and thereby prevent the bolts 9 from clamping theheads 8 against the disk tightly enough to prevent the rotation of thescrews'7, as shown in 5. i

Itwill of course be understoodthat the grinding devices or breakers mayproject any desired distance beyond the face-plate and that theclearance-spaces between the breakers or grinding devices of the'twodisks IOO may be as large as desired to adapt the apparatus to the workfor which it is designed.

It will be readily understood from the foregoing description that whenthe grindingdisks are rapidly rotated in opposite directions the rows ofscrews or other many-pointed grinding devices will present numerouscutting contacts or points to such material as may be run between them,and because of the fact that the cutting devices rotate in theface-plates said devices will last a great while and maintain theeficiency of the apparatus. It is also obvious that it will be onlynecessary to remove the grinding' devices when they become worn orbroken, the face-plates lasting indefinitely. It will of course beunderstood that this apparatus may be employed in a horizontal positionas well as in a vertical position.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A grinding device consisting of a disk` a removable face-plate, andremovable rotatable breakers or grinding devices removably secured tothe face of the disk by the faceplate.

2. A grinding device consisting of a disk, a plurality of annular rowsof breakers or grinding devices secured thereto, said devices beingformed with a plurality of cuttingpoints and being freely rotatableindependently of each other and the disk.

3. A grinding` device consisting of a disk, a face-plate removablysecured thereto, and a plurality of rows of grinding devices or breakersrotatably mounted in said face-plate.

4. A grinding device consisting of a disk, a face-plate removablysecured to the carrierplate, and a plurality of rows of breakers orgrinding devices formed with a plurality of cutting-points and rotatablymounted in the face-plate.

5. A grinding device consisting of a disk, a face-plate formed insegments, a plurality of rows of breakers or grinding devices rotatablymounted in the face-plate and formed with heads on their inner ends,said heads lying between the disk and the face-plate, and means forremovably securing the face-plate segments to the disk, whereby thegrinding devices are secured in position.

6. A-grinding device consisting of a disk, a face-plate formed insegments, a plurality of rows of breakers or grinding devices rotatablymounted in the face-plate and formed with heads on their inner ends andwith a plurality of annular cutting-points at their outerends, saidheads lying between the carrier-plate and the face-plate, and means forremovably securing the face-plate segments to the carrierplate, wherebythe grinding devices are secured in position.

7. A grinding device consisting of a disk, a face-plate secured thereto,and a series of freely and independently rotatable grinding devicescarried by said face-plate.

8. A grinding device consisting of a disk, a plurality of annular rowsof breakers or grinding devices secured thereto and provided with aseries of annular cutting-points, said devices being held rotatably inthe disk.

9. A grinding device consisting of a disk, a face-plate formed insections and removably attached to the disk, a plurality of breakersmounted in the face-plate and formed with heads on their inner ends andannular cutting edges on their projecting ends, said heads lying betweenthe disk and the face-plate, and means for removably securing theface-plate sections to the disk, whereby the breakers are removablysecured in position.

l0. A grinding device consisting of a disk, a face-plate and means forremovably securing it to the disk, a series of grinding devicesrotatably mounted in the face-plate and formed with heads on their innerends, said heads lying between the disk and the face-plate.

1I. In combination with a grinding-disk, a. face-plate secured theretoand made up of independently-removable sections, and breakers attachedto the face of the disk by said face-plate, these breakers beingindependently removable from the face-plate sections, and each beingprovided with a series of annular cutting edges.

l2. In a grinding-machine, the combination of a pair of rotatablegrinding-disks arranged face to face, a plurality of rows of grindingdevices on the face of each disk, the rows carried by one disk workingbetween the rows carried by the other disk and the working faces of eachgrinding device being screwthreaded to provide a series of annularcutting edges.

In testimony whereof I hereunto aliix my signature, in the presence oftwo witnesses, this 16th day of December, 1903.

OMA GARR.

fitnessesz G. H. BAILIE, H. T. WiLsoN.

lOO

